Chuck foe holding flanged bodies



(NoMoaeL) 2 sheets-sheet 1.

I'. H. FLOTTMANN. CHUCK POR HOLDING FLANGED BODIES.

PatentedDec. 10, 1895.

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2 Sheets-Sheet 2.

(No Model.)

P. H. PLOTTMANN. GHUGK PUR HOLDING FLANGBD BODIES.

` .Patented Dec. 1.o, 1895.

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EGRNIAM, PHGTO'LUHDAWASHINGTUN. U C

NITED STATES PATENT OFFICE.

FRIEDRICH HEINRICH FLOT'IMANN, OF BOCHUM, GERMANY.

CHUCK FOR HOLDING FLANGED BODIES. v

SPECIFICATION forming part of Letters Patent No. 551,117, dated December10, 1895.

Application filed June 16, 1894. Serial No. 514,773. (No model.)

T @ZZ whom t may concern,.-

Be it known that I, FRIEDRICH HEINRICH FLOTTMANN, a subject of theGerman Emperor, residing at Bochum, inthe Empire of Germany, haveinvented a certain new and useful Chuck for Holding Flanged Bodies, ofwhich the following is a specification.

My invention is an improved work-holder 4 comprising a yoke havingoffsets provided axis of the work-piece.

with recesses and recessed clamping-pieces, with means for holding theclamping-pieces in a certain relation to the offsets, as will behereinafter pointed out.

To enable my invention to be fully under'- stood, I will describe how itcan be carried into practice by reference to the accompanying drawings,in which- Figure l is a plan, Fig. 2 is a side view, Fig. 3 is a frontview, and Fig. 4 is an elevation, of the work-piece. Fig. 5 is a sectionthereof. Fig. 6 is an inner View of the upper clamping part. Fig. 7 is aplan thereof, and Fig. 8 is a detail representing a clamp-piece.

Similar reference-letters indicate similar parts throughout thedrawings.

The means for carrying out the invention consist, essentially, of ayoke-shaped clamp a, which is threaded at the central part, so that itmay be screwed into the spindle CZ of the machine. The clamp d is setoff at a, Fig. 6, while at the front part it is provided with a recessa2. Into these recesses the workpiece h is placed. For this purpose theworkpiece is provided with cross-ribs c at two opposite sides, thebranches of these ribs being arranged symmetrically and vertically tothe The work-piece is then placed in such a manner that one rib liesbetween the recess a2, while the ribs vertical thereto rest upon theoffset a.

After having placed the work-piece it is xed to the clamp. This iseffected by means of two clamp-pieces d, Fig. 8, through which arepassed the screw-bolts e, fixed to the clamp, and are held in place by-means of nuts f. As shown by Fig. S, the clamp-pieces are provided witha recess in which the fourth rib is adapted to fit, so that theclamppieces in tightening the nuts press upon the two resting ribs. Bythis way the work-piece is secured against any lateral displacement.

In the example shown the work-piece is provided -with three anges b b2b3 to be wrought or turned, the flange b being just in working position.The iiange b' being wrought, the work-piece is removed, whereupon itisturned about ninety degrees and placed -again into the clamp, so thatother branches of the cross-ribs serve as a rest, and the second angemay be wrought. |The third flange is wrought in similar manner, and soon.

It is obvious that instead of the cross-ribs, also other regular ribs-assquare, pentagonal, zc., ribs-may be used. In every case, however, theclamps must be provided with the reversed forms of the work-pieces inquestion.

Iith the same advantage the described device may be used in such casesin which the work-piece is fixed, while the tools are Inovable.

Having now described and ascertained the nature of my invention and inwhat manner the same is to be performed, I declare that what I claim is-In combination with the yoke a, the offsets a, having the recesses a2and the recessed clamp pieces, and means for holding the clamping pieceto the yoke and adjacent to the offset a' with a recess between the sameand the clamping piece', substantially as described.

Signed at Barmen, Germany, this 31st day of May, in the year 1894.

FRIEDRICH HEINRICH FLOTTMANN.

Witnesses: Y

WILLIAM EssENWEIN, T. H. STRAUss.

